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• W4290854015 abstract "In this paper, we propose a compression-based anomaly detection method for time series and sequence data using a pattern dictionary. The proposed method is capable of learning complex patterns in a training data sequence, using these learned patterns to detect potentially anomalous patterns in a test data sequence. The proposed pattern dictionary method uses a measure of complexity of the test sequence as an anomaly score that can be used to perform stand-alone anomaly detection. We also show that when combined with a universal source coder, the proposed pattern dictionary yields a powerful atypicality detector that is equally applicable to anomaly detection. The pattern dictionary-based atypicality detector uses an anomaly score defined as the difference between the complexity of the test sequence data encoded by the trained pattern dictionary (typical) encoder and the universal (atypical) encoder, respectively. We consider two complexity measures: the number of parsed phrases in the sequence, and the length of the encoded sequence (codelength). Specializing to a particular type of universal encoder, the Tree-Structured Lempel–Ziv (LZ78), we obtain a novel non-asymptotic upper bound, in terms of the Lambert W function, on the number of distinct phrases resulting from the LZ78 parser. This non-asymptotic bound determines the range of anomaly score. As a concrete application, we illustrate the pattern dictionary framework for constructing a baseline of health against which anomalous deviations can be detected." @default.
• W4290854015 created "2022-08-12" @default.
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• W4290854015 date "2022-08-09" @default.
• W4290854015 modified "2023-10-14" @default.
• W4290854015 title "A Pattern Dictionary Method for Anomaly Detection" @default.
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• W4290854015 doi "https://doi.org/10.3390/e24081095" @default.
• W4290854015 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36010758" @default.
• W4290854015 hasPublicationYear "2022" @default.
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